Synthesis and enhanced electromagnetic absorption properties of Co-doped CeO2/RGO nanocomposites

Shen, Ziyao; Xing, Honglong; Wang, Huan; Jia, Haipeng; Liu, Ye; Chen, Aijuan; Yang, Peiyue

doi:10.1016/j.jallcom.2018.04.195

Cited by 55 publications

(17 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on E vf , we screened the dopant candidates for TM elements Mn and Fe, Co, Ni, Ru, Rh, Pd, Ag, Ir, Os, Pt, and Au in groups VIII to XI and periods 4 to 6 (Figure b). These metals have all previously been shown to increase the catalytic activity of CeO 2 by single doping or impregnation …”

Section: Resultsmentioning

confidence: 99%

Rational Design of Transition Metal Co‐Doped Ceria Catalysts for Low‐Temperature CO Oxidation

et al. 2019

View full text Add to dashboard Cite

We present a highly active CeO 2 -based catalyst for oxidizing CO in automobile exhaust. This catalyst was systemically designed by co-doping with transition metals (TMs). First, we used density functional theory (DFT) calculations to screen Mn and 13 dopant TMs (periods 4~6 in groups VIII~XI) and their 91 binary combinations for co-doping. As a result, Cu and (Cu, Ag) were found to be the best candidates among the single and binary dopants, respectively. Next, we synthesized CeO 2 nano-particles doped with Cu or (Cu, Ag), then experimentally confirmed that the predicted (Cu, Ag) co-doped CeO 2 showed higher activity than pure CeO 2 and other TM-doped CeO 2 . This was attributed to the easy formation of oxygen vacancies in the lattice of CeO 2 . Our study demonstrates that the use of a rational design of CeO 2 -based catalyst through theoretical calculations and experimental validation can effectively improve the low-temperature catalytic activity of CO oxidation.

show abstract

Section: Resultsmentioning

confidence: 99%

Rational Design of Transition Metal Co‐Doped Ceria Catalysts for Low‐Temperature CO Oxidation

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Cerium-based compounds (containing Ce(OH) 3 , Ce 2 O 3 , and CeO 2 ) have promising applications as gas sensors, industrial catalysts, and solid oxide fuel cells due to their abundant defects, 4f electrons, and lanthanide contraction effect. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] Besides, cerium-based compounds can function as microwave absorbers due to polarization loss induced by oxygen vacancy defects. But they still do not have a wide range of applications since they bear a narrow bandwidth (EABW/d = 0.06-3.85 GHz mm À1 ), a thick thickness (2.0-6.5 mm), and a high filling ratio (450%) owing to the lack of ferromagnetic resonances and/or polarizations.…”

Section: Introductionmentioning

confidence: 99%

Synchronously boosting microwave-absorbing and heat-conducting capabilities in CeO₂/Ce(OH)₃ core–shell nanorods/nanofibers via Fe-doping amount control

et al. 2023

View full text Add to dashboard Cite

show abstract

“…20−22 It is worth mentioning that oxygen vacancies are closely related to the microwave absorption characteristics in terms of improving electrical conductivity and enhancing polarization relaxation. 23,24 Compared with the MnO 2 particles and nanosheets, MnO 2 nanorods are conducive to construct a three-dimensional conductive network, thereby enhancing the conductance loss. A previous study has found that the incorporation of MnO 2 nanorods can tune the dielectric performance of Ti 3 C 2 T x MXene to show controllable microwave absorption.…”

Section: Introductionmentioning

confidence: 99%

“…This is mainly attributed to the effective adjustment of the dielectric constant of MnO 2 with Ni doping. Additionally, Ni doping could induce a valence state change in the material, which is likely to induce a large number of vacancy defects to balance the valence state. − It is worth mentioning that oxygen vacancies are closely related to the microwave absorption characteristics in terms of improving electrical conductivity and enhancing polarization relaxation. , Compared with the MnO 2 particles and nanosheets, MnO 2 nanorods are conducive to construct a three-dimensional conductive network, thereby enhancing the conductance loss. A previous study has found that the incorporation of MnO 2 nanorods can tune the dielectric performance of Ti 3 C 2 T x MXene to show controllable microwave absorption .…”

Section: Introductionmentioning

confidence: 99%

Ni Doping in MnO₂/MXene (Ti₃C₂T_x) Composites to Modulate the Oxygen Vacancies for Boosting Microwave Absorption

Huang

et al. 2022

ACS Appl. Electron. Mater.

View full text Add to dashboard Cite

Endowing composites with defects such as oxygen vacancies is an easy and effective strategy to determine the physical and chemical properties of nanomaterials. The influence of defects on microwave absorption remains a very open question. Herein, MnO2/Ti3C2T x MXene composites are self-assembled, demonstrating the boosting of microwave absorption through Ni doping in MnO2 to modulate the oxygen vacancies. The Ni-doped MnO2 (Ni–MnO2) nanorods with diameters of about 40 nm are dispersed on the surface and interlay of MXene. As expected, the reflection loss (RL) value and effective absorption bandwidth (EAB) of Ni–MnO2/MXene composites are −55.9 dB and 6.32 GHz, which are greatly enhanced over pure MnO2/MXene with −18.8 dB and 4.56 GHz. This excellent microwave absorption is mainly attributed to the optimized impedance matching in Ni–MnO2/MXene composites. In addition, the random distribution of MnO2 nanorods and MXene layers will form a conductive network, leading to the inducing microcurrent to form conduction losses. Moreover, interfacial polarization between layered MXene and Ni–MnO2 and dipole polarization induced by oxygen defects yield a strongly dielectric loss. Thus, our work provides a novel principle of modulation in oxygen vacancies to develop efficient MXene-based multicomponent composites for electromagnetic wave absorption.

show abstract

Synthesis and enhanced electromagnetic absorption properties of Co-doped CeO2/RGO nanocomposites

Cited by 55 publications

References 41 publications

Rational Design of Transition Metal Co‐Doped Ceria Catalysts for Low‐Temperature CO Oxidation

Rational Design of Transition Metal Co‐Doped Ceria Catalysts for Low‐Temperature CO Oxidation

Synchronously boosting microwave-absorbing and heat-conducting capabilities in CeO₂/Ce(OH)₃ core–shell nanorods/nanofibers via Fe-doping amount control

Ni Doping in MnO₂/MXene (Ti₃C₂T_x) Composites to Modulate the Oxygen Vacancies for Boosting Microwave Absorption

Contact Info

Product

Resources

About

Synthesis and enhanced electromagnetic absorption properties of Co-doped CeO2/RGO nanocomposites

Cited by 55 publications

References 41 publications

Rational Design of Transition Metal Co‐Doped Ceria Catalysts for Low‐Temperature CO Oxidation

Rational Design of Transition Metal Co‐Doped Ceria Catalysts for Low‐Temperature CO Oxidation

Synchronously boosting microwave-absorbing and heat-conducting capabilities in CeO2/Ce(OH)3 core–shell nanorods/nanofibers via Fe-doping amount control

Ni Doping in MnO2/MXene (Ti3C2Tx) Composites to Modulate the Oxygen Vacancies for Boosting Microwave Absorption

Contact Info

Product

Resources

About

Synchronously boosting microwave-absorbing and heat-conducting capabilities in CeO₂/Ce(OH)₃ core–shell nanorods/nanofibers via Fe-doping amount control

Ni Doping in MnO₂/MXene (Ti₃C₂T_x) Composites to Modulate the Oxygen Vacancies for Boosting Microwave Absorption